Pregunta 1
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Number of moles= Volume/24
Pregunta 2
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Number of moles= volume X concentration
Pregunta 3
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Number of moles= mass/mr
Pregunta 4
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0 degrees kelvin= 273 degrees celsius
Pregunta 5
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1 moles= 6.022 X 10^23
Pregunta 6
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The nucleus is made up of?
Pregunta 7
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A: The mass number (nucleon number) tells you?
Pregunta 8
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Z: Atomic (proton) number tells you?
Pregunta 9
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Isotopes are atoms of the same element with a different number of neutrons.
Pregunta 10
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Isotopes have the same mass numbers.
Pregunta 11
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Between isotopes chemical properties vary but physical properties are the same.
Pregunta 12
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Relative atomic mass (Ar)
Respuesta
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the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the C-12 isotope.
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weighted mean mass of an atom of an element compared with 1/12 of the mass of a C-12 atom.
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mass per mole of a substance (g/mol)
Pregunta 13
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Acids (proton donor, H+ ions being the active ingredient)
Pregunta 14
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Bases (proton acceptors)
Pregunta 15
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Alkalis are insoluble bases.
Pregunta 16
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A salt is an ionic chemical compound.
Pregunta 17
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A positive ion is known as a?
Pregunta 18
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A salt is produced when an acid is neutralised with?
Respuesta
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A carbonate
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A base
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An alkali
Pregunta 19
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Ammonium salts can be used as artificial fertilisers.
Pregunta 20
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The oxidation state of a free element is it's group number.
Pregunta 21
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The sum of the oxidation states in a molecule= number of atoms in the molecule.
Pregunta 22
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Oxidation is the?
Respuesta
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loss of electrons
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gaining of electrons
Pregunta 23
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After reduction the oxidation state?
Pregunta 24
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A reducing agent is oxidised in the reaction.
Pregunta 25
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Monatomic ions oxidation states is their charge.